摘要
阿希金矿床是新疆西天山地区典型的低硫型浅成低温热液矿床。以阿希金矿床中的黄铁矿作为研究对象,在黄铁矿显微结构研究的基础上,利用LA-ICP-MS对黄铁矿的微量元素进行原位分析。研究结果表明:阿希金矿床的黄铁矿从早到晚依次划分为4个世代,分别是中粗粒压碎状黄铁矿(PyⅠ)、中细粒自形黄铁矿(PyⅡ)、中粗粒锯齿状黄铁矿(PyⅢ)和细粒黄铁矿(PyⅣ);该矿床黄铁矿具富As,Sb和Ni,贫Te和Se的特点,Co与Ni的质量分数之比即w(Co)/w(Ni)绝大多数小于1,反映出矿床的成矿温度较低;黄铁矿中As,Sb,Co和Ni多以类质同象的形式存在;Au和Ag在PyⅡ中多以银金矿包裹体的形式存在,PyⅢ中则多以自然金和自然银的形式存在;Pb,Cu和Zn则多以包裹体的形式存在。推测PyⅠ可能形成于早期火山热液与大气降水流体叠加改造的热液环境,而PyⅡ和PyⅢ形成于以大气降水为主的热液环境。
The Axi gold deposit in the western Tianshan is a typical low-sulfidation epithermal deposit. Based on the study of pyrite microstructure, the trace elements of the pyrite were analyzed by LA-ICP-MS. The results show that pyrite is divided into four generations in succession, i.e. coarse crushing like pyrite（PyⅠ）, fine-grained euhedral pyrite（PyⅡ）, coarse serrated pyrite（PyⅢ） and fine-grained pyrite（PyⅣ）. The pyrite is rich in As, Sb and Ni, and is poor in Te and Se, and the majority of w（Co）/w（Ni） is less than 1,which reflects the low metallogenic temperature of the deposit. As, Sb, Co and Ni in the pyrite are mostly in the form of homo-isomorphs, Au and Ag probably occur as electrum inclusions in the Py II. However, Au and Ag occur as the microscopic-gold and free-silver in the PyⅢ, and Pb, Cu and Zn are mostly in the form of inclusions. PyⅠoriginates from the common action of the hydrothermal fluids and the meteoric water fluids, while PyⅡand PyⅢ form in the process of circulating meteoric water fluids.
作者
毛先成
潘敏
刘占坤
汪凡云
邓浩
韩建民
樊红喜
夏芳
肖飞
魏清峰
三金柱
MAO Xiancheng1, 2, PAN Min1, 2, LIU Zhankun1, 2, WANG Fanyun1, 2, DENG Hao1, 2, HAN Jianmin3, FAN Hongxi3, XIA Fang1, 2, XIAO Fei3, WEI Qingfeng3, SAN Jinzhu3(1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Central South University, Changsha 410083, China; 2. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China; 3. Xingjiang Nonferrous Metal Industry （Group） Co. Ltd., Urumqi 830000, China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2018年第5期1148-1159,共12页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(41472301)
中南大学"创新驱动计划"项目(2015CX008)~~
